.panel {
    background: #000;
    height: 100vh;
    width: 100vw;
    position: relative;
    overflow: hidden;
    color: #ffffff;
}

body {
    margin: 0;
    overflow: hidden;
}

.container {
    position: absolute;
    width: 100vw;
    height: 100vh;
    transition: all .3s;
}

.container.no-ani {
    transition: all 0s;
    background: chartreuse;
}
